When my engine is running and warmed up, every few secs or so there is a fairly loud ticking or clicking noise. I am tring to identify this, from some preliminary googling it could be a head stud bolt that has come off inside the valve cover. I have uploaded a video of this and would greatly appreciate some assistance identifying the cause of the noise.
Member # 2899
1972 911T
2004 996 C4S
2001 996 Carrera
2008 Cayenne S (sold)
2004 Cayenne Turbo (sold)
2009 997 cabriolet (sold)
2002 996 Turbo (sold)
1998 Boxster S (sold)
1997 993 cab (sold)
1989 911 3.2 Carrera (sold)
Spawny,
I would ask if the idle changes, even minutely, when you hear the tick? ... I think I heard a slight momentary change...
If so I would ask when the last (or if ever) you had your throttle bodies rebuilt?
As a test I would 'play' with the air adjusting screws, one at a time, and see if there is any change...
I had a similar ticking sound just before I had my tb's rebuilt... the ticking was at idle when the compression was hitting the badly worn throttle plates, shafts, and bushings causing an intermittent tick/w an ever so slight hiccup in the idle when it occurred ...
It's worth a try..........
Chuck Miller
Creative Advisor/Message Board Moderator - Early 911S Registry #109
R Gruppe #88
TYP901 #62
'73S cpe #1099 - Matched # 2.7/9.5 RS spec rebuild
'67 Malibu 327 spt cpe - Period 350 Rebuild
’98 Chevy S-10 – Utility
’15 GTI – Commuter
The MFI was rebuilt by Pacific Fuel Injection about 6 months ago, so I hope that is OK. I'll fire her up again today and see if I can detect the idle changing when the tick occurs. The car is running rich and the plugs are sooty, so it probably needs some tweaking anyway. Can anyone recommend a decent mechanic in the Bay area who could look at this?
Member # 2899
1972 911T
2004 996 C4S
2001 996 Carrera
2008 Cayenne S (sold)
2004 Cayenne Turbo (sold)
2009 997 cabriolet (sold)
2002 996 Turbo (sold)
1998 Boxster S (sold)
1997 993 cab (sold)
1989 911 3.2 Carrera (sold)
There are two different subjects here, Chuck is referring to the throttle bodies but you are confusing them with the MFI pump rebuilt by Gus,,,,,two different MFI parts, Gus does the pumps, not the throttle bodies. Just trying avoid confusion of terms here.
Early S Registry member #90
R Gruppe member #138
Fort Worth Tx.
Not that I know ANYTHING close to Ed or Chuck.... but
I can't hear a "regular" ticking. I hear an irregular tick/pop
Is the sound you hear metallic? You likely have thought of the following, but..
Possible sources that I'd think of
throttle bodies
valves (when is the last time they were adjusted? Loose valves will tick when warm)
timing chain slap
Rod knock (low oil pressure = knocking sound)
E911SR & RGRUPPE
'65 911 "The Ol' Gal" (long gone)
'73 S Coupe #306
I will try to get someone to look at the throttle bodies. I am reading the MFI section of Wayne Dempsey's 'Rebuild your 911 motor' book now and it certainly seems be beyond my abilities.
The ticking is very metallic and not regular, its on average every 5 secs, but could happen twice in a second or not for 10 secs. It doesn't do it when the engine is cold. I'll try and localize the sound with a stethoscope.
Member # 2899
1972 911T
2004 996 C4S
2001 996 Carrera
2008 Cayenne S (sold)
2004 Cayenne Turbo (sold)
2009 997 cabriolet (sold)
2002 996 Turbo (sold)
1998 Boxster S (sold)
1997 993 cab (sold)
1989 911 3.2 Carrera (sold)
i know this is an old thread, but I'm having the exact same symptom. What did you end up finding as the problem?
Thanks!
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